@article{JLT_2012_22_3_JLT_2012_22_3_a7,
     author = {H. He and J. W. Hoffman },
     title = {Picard {Groups} of {Siegel} {Modular} {3-Folds} and {\ensuremath{\theta}-Liftings}},
     journal = {Journal of Lie theory},
     pages = {769--801},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/JLT_2012_22_3_JLT_2012_22_3_a7/}
}